1 files changed, 132 insertions, 0 deletions
diff --git a/spec/lib/gitlab/color_spec.rb b/spec/lib/gitlab/color_spec.rb
new file mode 100644
index 00000000000..8b16e13fa4d
--- /dev/null
+++ b/spec/lib/gitlab/color_spec.rb
@@ -0,0 +1,132 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+RSpec.describe Gitlab::Color do
+  describe ".of" do
+    described_class::Constants::COLOR_NAME_TO_HEX.each do |name, value|
+      it "parses #{name} to #{value}" do
+        expect(described_class.of(name)).to eq(value)
+      end
+    end
+
+    it 'parses hex literals as colors' do
+      expect(described_class.of('#fff')).to eq(described_class.new('#fff'))
+      expect(described_class.of('#fefefe')).to eq(described_class.new('#fefefe'))
+    end
+
+    it 'raises if the input is nil' do
+      expect { described_class.of(nil) }.to raise_error(ArgumentError)
+    end
+
+    it 'returns an invalid color if the input is not valid' do
+      expect(described_class.of('unknown color')).not_to be_valid
+    end
+  end
+
+  describe '#new' do
+    it 'handles nil values' do
+      expect(described_class.new(nil)).to eq(described_class.new(nil))
+    end
+
+    it 'strips input' do
+      expect(described_class.new('  abc  ')).to eq(described_class.new('abc'))
+    end
+  end
+
+  describe '#valid?' do
+    described_class::Constants::COLOR_NAME_TO_HEX.each_key do |name|
+      specify "#{name} is a valid color" do
+        expect(described_class.of(name)).to be_valid
+      end
+    end
+
+    specify '#fff is a valid color' do
+      expect(described_class.new('#fff')).to be_valid
+    end
+
+    specify '#ffffff is a valid color' do
+      expect(described_class.new('#ffffff')).to be_valid
+    end
+
+    specify '#ABCDEF is a valid color' do
+      expect(described_class.new('#ABCDEF')).to be_valid
+    end
+
+    specify '#123456 is a valid color' do
+      expect(described_class.new('#123456')).to be_valid
+    end
+
+    specify '#1234567 is not a valid color' do
+      expect(described_class.new('#1234567')).not_to be_valid
+    end
+
+    specify 'fff is not a valid color' do
+      expect(described_class.new('fff')).not_to be_valid
+    end
+
+    specify '#deadbeaf is not a valid color' do
+      expect(described_class.new('#deadbeaf')).not_to be_valid
+    end
+
+    specify '#a1b2c3 is a valid color' do
+      expect(described_class.new('#a1b2c3')).to be_valid
+    end
+
+    specify 'nil is not a valid color' do
+      expect(described_class.new(nil)).not_to be_valid
+    end
+  end
+
+  describe '#light?' do
+    specify '#fff is light' do
+      expect(described_class.new('#fff')).to be_light
+    end
+
+    specify '#a7a7a7 is light' do
+      expect(described_class.new('#a7a7a7')).to be_light
+    end
+
+    specify '#a6a7a7 is dark' do
+      expect(described_class.new('#a6a7a7')).not_to be_light
+    end
+
+    specify '#000 is dark' do
+      expect(described_class.new('#000')).not_to be_light
+    end
+
+    specify 'invalid colors are not light' do
+      expect(described_class.new('not-a-color')).not_to be_light
+    end
+  end
+
+  describe '#contrast' do
+    context 'with light colors' do
+      it 'is dark' do
+        %w[#fff #fefefe #a7a7a7].each do |hex|
+          expect(described_class.new(hex)).to have_attributes(
+            contrast: described_class::Constants::DARK,
+            luminosity: :light
+          )
+        end
+      end
+    end
+
+    context 'with dark colors' do
+      it 'is light' do
+        %w[#000 #a6a7a7].each do |hex|
+          expect(described_class.new(hex)).to have_attributes(
+            contrast: described_class::Constants::LIGHT,
+            luminosity: :dark
+          )
+        end
+      end
+    end
+  end
+
+  describe 'as_json' do
+    it 'serializes correctly' do
+      expect(described_class.new('#f0f1f2').as_json).to eq('#f0f1f2')
+    end
+  end
+end